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000431_news@columbia.edu_Mon Jul 24 08:20:41 1995.msg
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Received: from apakabar.cc.columbia.edu by watsun.cc.columbia.edu with SMTP id AA28092
(5.65c+CU/IDA-1.4.4/HLK for <kermit.misc@watsun.cc.columbia.edu>); Tue, 25 Jul 1995 17:00:56 -0400
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Newsgroups: comp.protocols.kermit.misc
Path: news.columbia.edu!panix!news.cloud9.net!worm.inch.com!uunet!in1.uu.net!omen!caf
From: caf@omen.com (Chuck Forsberg WA7KGX)
Subject: Re: Kermit download from CompuServe.. best setup??
Organization: Omen Technology INC
Date: Mon, 24 Jul 1995 08:20:41 GMT
Message-Id: <DC7oIH.6IA@omen.com>
References: <3uidtu$r5c@hpber004.swiss.hp.com> <3ulp8c$ep5@apakabar.cc.columbia.edu> <DC4Cr1.BB8@omen.com> <MpREww8Z7mxH084yn@netcom.com>
Lines: 42
Apparently-To: kermit.misc@watsun.cc.columbia.edu
In article <MpREww8Z7mxH084yn@netcom.com>,
Jeffrey Hurwit <jhurwit@netcom.com> wrote:
>In article <DC4Cr1.BB8@omen.com>, caf@omen.com (Chuck Forsberg WA7KGX) wrote:
>
>>CompuServe claim they have not widely deployed ZMODEM because it
>>consumes too many resources. I suspect CompuServe have made the
>>same measurements of system resources consumed by sz and Ckermit
>>and concluded that Ckermit is far more resource intensive than sz.
>
> I'm sure that a C-Kermit built with all the options is more
> resource intensive, but then, that's because it does more.
> However, C-Kermit comes with a rich set of defines that permit it
> to be installed without features that'll never be used. In extreme
> cases, it could be compiled with all but the protocol itself left
> out (though I couldn't imagine leaving out the script interpreter!).
The complexity of the Kermit protocol with its window management and
other features exacts a penalty in CPU resources. Let's compare sz
(a link to Unix Professional-YAM) and CKermit 5a 190:
(38kb direct connect)
ls -l *gif
-rw-r--r-- 1 caf omen 352650 Feb 8 1992 b17mh.gif
time kermit -s b17mh.gif
real 1m38.97s user 0m1.74s sys 0m0.44s Kermit
time sz -y b17mh.gif
real 1m36.58s user 0m0.17s sys 0m0.18s ZMODEM
time sz -ym b17mh.gif
real 1m35.01s user 0m0.09s sys 0m0.13s ZMODEM-90(Tm)
The Unix CPU utilization is much higher with CKermit than with
Professional-YAM. This can be critical on a multisuer system.
The files were received by a 32 bit beta test version of Professional-YAM
for WIN32 running on a P75 and Windows 95 build 950-r6 ("gold").
--
Chuck Forsberg WA7KGX caf@omen.COM 503-621-3406 FAX:-3735
Omen Technology Inc "The High Reliability Software"
Author of YMODEM, ZMODEM, Professional-YAM, ZCOMM, GSZ and DSZ
TeleGodzilla BBS: 503-621-3746 FTP: ftp.cs.pdx.edu pub/zmodem